1From 657a83673cf21db3f6c73fe89785687f6514ef83 Mon Sep 17 00:00:00 2001
2From: Jeffy Chen <jeffy.chen@rock-chips.com>
3Date: Wed, 11 May 2022 17:24:49 +0800
4Subject: [PATCH 08/12] v4l2src: Support setting max resolution
5
6Set env "GST_V4L2SRC_MAX_RESOLUTION" to limit resolution, for example:
7export GST_V4L2SRC_MAX_RESOLUTION=1920x1080
8
9Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
10---
11 sys/v4l2/gstv4l2object.c | 19 +++++++++++++------
12 1 file changed, 13 insertions(+), 6 deletions(-)
13
14diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
15index 19ae751..09fabf0 100644
16--- a/sys/v4l2/gstv4l2object.c
17+++ b/sys/v4l2/gstv4l2object.c
18@@ -2810,6 +2810,7 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
19   gint fd = v4l2object->video_fd;
20   struct v4l2_frmsizeenum size;
21   GList *results = NULL;
22+  guint32 max_width = G_MAXINT, max_height = G_MAXINT;
23   guint32 w, h;
24
25   if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G')) {
26@@ -2817,6 +2818,12 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
27     return ret;
28   }
29
30+  if (!V4L2_TYPE_IS_OUTPUT (v4l2object->type)) {
31+    const gchar *buf = g_getenv ("GST_V4L2SRC_MAX_RESOLUTION");
32+    if (buf)
33+      sscanf (buf, "%ux%u", &max_width, &max_height);
34+  }
35+
36   memset (&size, 0, sizeof (struct v4l2_frmsizeenum));
37   size.index = 0;
38   size.pixel_format = pixelformat;
39@@ -2833,8 +2840,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
40       GST_LOG_OBJECT (v4l2object->dbg_obj, "got discrete frame size %dx%d",
41           size.discrete.width, size.discrete.height);
42
43-      w = MIN (size.discrete.width, G_MAXINT);
44-      h = MIN (size.discrete.height, G_MAXINT);
45+      w = MIN (size.discrete.width, max_width);
46+      h = MIN (size.discrete.height, max_height);
47
48       if (w && h) {
49         tmp =
50@@ -2868,8 +2875,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
51
52     w = MAX (size.stepwise.min_width, 1);
53     h = MAX (size.stepwise.min_height, 1);
54-    maxw = MIN (size.stepwise.max_width, G_MAXINT);
55-    maxh = MIN (size.stepwise.max_height, G_MAXINT);
56+    maxw = MIN (size.stepwise.max_width, max_width);
57+    maxh = MIN (size.stepwise.max_height, max_height);
58
59     step_w = MAX (size.stepwise.step_width, 1);
60     step_h = MAX (size.stepwise.step_height, 1);
61@@ -2909,8 +2916,8 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
62
63     w = MAX (size.stepwise.min_width, 1);
64     h = MAX (size.stepwise.min_height, 1);
65-    maxw = MIN (size.stepwise.max_width, G_MAXINT);
66-    maxh = MIN (size.stepwise.max_height, G_MAXINT);
67+    maxw = MIN (size.stepwise.max_width, max_width);
68+    maxh = MIN (size.stepwise.max_height, max_height);
69
70     tmp =
71         gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat,
72--
732.20.1
74
75